矩形超高层建筑归一化横风向脉动风荷载谱模型  

Normalized cross-wind fluctuating wind load spectrum model of rectangular super high-rise buildings

作　　者：丘杏逢 曾加东 张志田 QIU Xingfeng;ZENG Jiadong;ZHANG Zhitian(College of Civil Engineering and Architecture,Hainan University,Haikou 570228,China)

机构地区：[1]海南大学土木建筑工程学院,海口570228

出　　处：《建筑结构》2023年第10期15-20,共6页Building Structure

基　　金：海南省自然科学基金资助项目(520RC545,520CXTD433);国家自然科学基金资助项目(52068020,51938012,52268012)。

摘　　要：为研究超高层建筑横风向脉动风荷载谱特性,在B、D两类紊流风场中开展了不同长宽比矩形刚性模型测压试验。结果表明:横风向脉动风荷载特性主要受紊流风场、气动外形和旋涡脱落等因素影响,矩形柱截面的长宽比变化将影响功率谱幅值及能量分布。当矩形柱截面长宽比小于3时,横风向脉动风荷载谱特性主要受旋涡脱落控制,但当长宽比超过3后,矩形柱侧面分离再附流动的影响逐渐加强,具体表现在:功率谱峰值减小、带宽增大及高频区出现较小谱峰。根据风洞试验结果和矩形柱横风向脉动风荷载谱特性,提出了归一化横风向脉动风荷载谱模型,该经验公式物理意义明确、形式简洁,有一定的工程参考意义。In order to study the characteristics of cross-wind fluctuating wind load spectrum of super high-rise buildings,pressure tests of rectangular rigid models with different aspect ratios were carried out in two types of turbulent wind fields B and D.The results show that the characteristics of cross-wind fluctuating wind load are mainly affected by factors such as turbulent wind field,aerodynamic shape and vortex shedding.The aspect ratio change of the rectangular column section will affect the power spectrum amplitude and energy distribution.When the aspect ratio of the rectangular column section is less than 3,the cross-wind fluctuating wind load spectrum characteristic is mainly controlled by the vortex shedding,but when it exceeds 3,the influence of the side separation and attached flow of the rectangular column gradually strengthens,which is shown in:the peak power spectrum decreases smaller,increased bandwidth,and smaller peaks appearing in the high-frequency region.According to the wind tunnel test results and the characteristics of the cross-wind fluctuating wind load spectrum of the rectangular column,a normalized cross-wind fluctuating wind load spectrum model was proposed.The empirical formula has clear physical meaning and concise form,which has certain engineering reference significance.

关 键 词：矩形超高层建筑 横风向脉动风荷载 风洞试验 归一化谱模型 

分 类 号：TU973.213[建筑科学—结构工程]